[jira] [Commented] (SOLR-7849) Secure Inter-node communication in a standard mechanism

["David Smiley (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-7849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17357452#comment-17357452 ] 

David Smiley commented on SOLR-7849:
------------------------------------

I'm confused on what {{ExecutorUtil.isSolrServerThread}} fundamentally means.  It has a comment: {{/// this tells whether a thread is owned/run by solr or not.}}.  Okay.  Is this ultimately to distinguish Client side (ExecutorUtil is in SolrJ so could be client side) vs Server side?  Or is it not that simple; are there a subset of server-side threads that we wouldn't want demarcated in this way for some reason?  Solr is a client to Solr itself sometimes; does that matter?  (think cross-cluster collection join).

> Secure Inter-node communication in a  standard mechanism
> --------------------------------------------------------
>
>                 Key: SOLR-7849
>                 URL: https://issues.apache.org/jira/browse/SOLR-7849
>             Project: Solr
>          Issue Type: Sub-task
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>            Priority: Major
>             Fix For: 5.3, 6.0
>
>         Attachments: SOLR-7849.patch, SOLR-7849.patch, SOLR-7849.patch, SOLR-7849.patch
>
>
> Relying on every Authentication plugin to secure the internode communication is error prone. Solr can standardize the authentication so that only the first request that comes from outside the cluster needs to be authenticated by the authentication plugin
> The scheme to protect the communication will be as follows
> * Every Solr node creates a an RSA key pair 
> * The private key is kept private and the public key is made available through a  core admin API
> * If authentication is enabled , every outgoing request will carry an extra header {{ SolrAuth : <nodename> encrypt_with_pvt_key(<original-user-principal> <timestamp>) }}
> * If authentication is enabled {{SolrDispatchFilter}} would look for this header and see the nodename
> ** If the public key of the nodename is available in cache , make a request to the node and fetch the public key
> ** If the public key has changed (because of a server restart) decryption fails and the public keyis fetched again
> * If the decryption succeeds , the user-name is set to what the header has encoded



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